Another of his contributions is the Easterlin hypothesis about long waves of baby booms and busts.
[1] He became interested in demography and population studies through his participation as a research associate from 1953 to 1955 in the landmark Study of population Redistribution and Economic Growth in the United States conducted by Simon Kuznets and Dorothy Thomas.
[2][3] Whilst completing his postgraduate studies, Easterlin worked as instructor from 1948 to 1953 at the University of Pennsylvania.
He was also the associate dean for budget and planning of the University of Pennsylvania Faculty of Arts and Sciences from 1974 to 1979.
Some Empirical Evidence" and the Easterlin paradox which he argued that contrary to expectation, happiness at a national level does not increase with income over time.